Malicious PDF — malware analysis report

Static analysis result for SHA-256 563d1720e812d636…

MALICIOUS

PDF

80.6 KB Created: 2021-09-19 00:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 68ad64674ea1cbc7489d2a92060cf19c SHA-1: c71e35f681299666f9313d0f150ca29a81287df0 SHA-256: 563d1720e812d636b7cdde87ebb2f684297c7e593713cad6439ae7e72bd823a7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs that form a link farm, directing users to potentially compromised websites. The presence of these links and the overall structure suggest an attempt to trick users into visiting malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://cructi.ru/uplcv?utm_term=use+usb+for+usb+tethering PDF link annotation
    • http://uzmansporzeminkaplama.com/resimler/files/vukutaditubumaravebajivig.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/davubopogibafopipa.pdfIn PDF document text
    • http://vitccorp.com/uploads/userfiles/file/sadek.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/dikemunuvonugutuxe.pdfIn PDF document text
    • http://be-now.pl/userfiles/file/46079675189.pdfIn PDF document text
    • http://vigen12.com/userfiles/file/salibag.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/47545036769.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d51319bb6d53798adbe79b1052b0bceb/92443170632.pdfIn PDF document text
    • http://thuaphatlailongthanh.vn/upload/contentFile/minhchau/file/46157061895.pdfIn PDF document text
    • https://isigakizima.net/img/tmp/file/zenexuvebovikibej.pdfIn PDF document text
    • https://advantage.ee/media/contents/file/gezuwifotilexonu.pdfIn PDF document text
    • https://red-adlay.com/upload/files/16075001305.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614370dfc3d4b---41980439477.pdfIn PDF document text
    • http://zdrowejaja.com/Upload/file/88292599112.pdfIn PDF document text
    • https://webornate.com/viking1/uploads/files/6165281197.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/b6c611e6e61340489a9205382c2d3b7d/zaziziwumolokulumiteza.pdfIn PDF document text
    • http://havefuntogether.com/image/upload/File/powijusijuxidukat.pdfIn PDF document text
    • http://studiorapizza.it/userfiles/files/xasitabejob.pdfIn PDF document text
    • http://lnaixi.com/userfiles/file/20210903194656_132233824.pdfIn PDF document text
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16142c65f29f9a---radifamixoviteg.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/nafedidonijonepiwomatit.pdfIn PDF document text
    • http://leylatoprak.com/userfiles/file/murewa.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/bimiruzata.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d70f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD70F 10532 bytes
SHA-256: ad0bdd50bc1774ff8f5710326c93c7b37cb025ae5a43333c9fb25ba9e01206e1
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 17440 bytes
SHA-256: 88d5c0388d0623f7dd0d6b16f068c212b3963267561e62f7580b930068099387
font_02_sfnt_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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